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MoO3-SnO2 base doped nano composite metal oxide and method for producing the same

A nano-composite and composite metal technology, used in instruments, measuring devices, scientific instruments, etc., can solve the problems of poor thermal stability and unsatisfactory selectivity.

Inactive Publication Date: 2008-10-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sensitivity to gas increases exponentially when the oxide particle size is reduced to be comparable to that of the oxide space charge layer, and SnO 2 It is sensitive to both oxidizing and reducing gases, and its sensitive temperature is lower than other oxides. It is suitable as a sensitive material for semiconductor gas sensors, but SnO is used alone 2 As a sensor material, its thermal stability is poor, and its selectivity is not ideal.

Method used

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  • MoO3-SnO2 base doped nano composite metal oxide and method for producing the same
  • MoO3-SnO2 base doped nano composite metal oxide and method for producing the same
  • MoO3-SnO2 base doped nano composite metal oxide and method for producing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A. Weigh 1.7529g of SnCl 4 ·5H 2 O was fully dissolved in 100ml distilled water to prepare 0.05M SnCl 4 solution, add dilute ammonia solution drop by drop under constant stirring, stop the dropwise addition when the pH value of the solution reaches 8, and obtain α-stannic acid sol precipitation, then place it for aging for 2 hours, filter and wash to remove Cl - , Disperse and dissolve the filtered sol in 50ml distilled water to make the concentration 0.1M.

[0023] B. Weigh 1.3241g of (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 75ml of water to make a concentration of 0.1M (NH 4 ) 6 Mo 7 o 24 4H 2 O solution, adjust the pH to 1 with nitric acid solution to convert it into a molybdic acid solution, and then add it dropwise to the above 50ml α-stannic acid sol solution to make the precipitation complete, leave it at room temperature for aging for 24 hours, and centrifuge at 4200rmp , dry the separated precipitate at 70°C, and roast at 600°C for 6 hours to obt...

Embodiment 2

[0025] A. with embodiment 1;

[0026] B. Add 0.2207g of (NH 4 ) 6 Mo 7 o 24 4H 2 O is dissolved in 12.5ml of distilled water, adjusted with nitric acid solution to make the pH value 1, and then added dropwise to the above-mentioned 50ml α-stannoic acid sol solution to make it precipitate completely. Others are the same as in Example 1, and finally obtain Sn / Mo MoO with a molar ratio of 4:1 3 -SnO 2 Composite powder. The measured average grain size of the material is about 13nm, and the specific surface area is 33m 2 / g.

Embodiment 3

[0028] A. Weigh 1.7529g of SnCl 4 ·5H 2 O and 0.0297 g of PdCl 2 Fully dissolved in 100ml distilled water to prepare 0.05M SnCl 4 and PdCl 2 Solution, add dilute ammonia solution drop by drop under constant stirring, stop dropping when the pH value of the solution reaches 8, and obtain the α-stannic acid sol precipitation containing a small amount of Pd, then place it for aging for 2 hours, filter, and disperse the filtered sol Dissolve in 50ml distilled water to make the concentration 0.1M;

[0029] B. The same as in Example 1, except that it is aged at room temperature for 12 hours, and baked at 600°C for 6 hours to obtain a composite powder PdO-MoO doped with PdO 3 -SnO 2 , wherein the mass ratio of Pd / Sn is 0.03:1.

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Abstract

The invention relates to a nanometer composite metal oxide with doped MoO3-SnO2 base and preparing method thereof; the chemical general equation of the nanometer composite metal oxide with doped MoO3-SnO2 base can be expressed as: Y-MoO3-SnO2, wherein, the mole ratio of Sn / Mo is 0.1 to 10 : 1, Y represents the doped metal oxide, and the quality ratio of the metal elements of the Y and the Sn is 0 to 0.05 :1; the invention adopts a fractional precipitation method, comprising the following steps: Alpha-stannic acid precipitate is prepared by pink salt, the filtered precipitate is scattered in the water so as to prepare Alpha-stannic acid sol the concentration of which is 0.02 to 0.2M, molybdenum salt solution is added by dipping, the pH value is regulated till the precipitation is completed, and the nanometer composite powder is prepared by drying and roasting; the powder is prepared into a sensor element which has higher sensitivity for NO2, CO and C2H5OH, the sensitivity and the selectivity thereof for NO2, CO and C2H5OH gas are improved by doping and wrapping a little of metal oxide, thus reducing the cross sensitivity of the NO2, CO and C2H5OH gas.

Description

Technical field: [0001] The present invention relates to a kind of MoO 3 -SnO 2 Base-doped nanocomposite metal oxide and preparation method thereof. The composite metal oxide can be used as a gas-sensing material. Background technique: [0002] SnO 2 Semiconductor metal oxides have good chemical and mechanical stability. Due to the intrinsic defect structure, they have strong surface adsorption and high mobility of conductive electrons. If it is made into a nanostructure material, as the ratio of the surface atomic number to the bulk phase atomic number increases, the particle size of the material decreases, showing quantum size effect and surface effect. The sensitivity to gas increases exponentially when the oxide particle size is reduced to be comparable to that of the oxide space charge layer, and SnO 2 It is sensitive to both oxidizing and reducing gases, and its sensitive temperature is lower than other oxides. It is suitable for use as a semiconductor gas sensor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/407
Inventor 白守礼周国君李殿卿杨鹏程罗瑞贤陈霭鸞
Owner BEIJING UNIV OF CHEM TECH
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